Dynamics of a supercritical composite shaft mounted on viscoelastic supports

摘要: Abstract The damping in a carbon fiber reinforced plastic (CFRP) laminate is greater than that which occurs most metallic materials. In the supercritical regime, can trigger unstable whirl oscillations, have catastrophic effects. vibrations occurring composite drive shaft are investigated here order to predict instabilities of this kind. A simply supported carbon/epoxy tube mounted on viscoelastic supports studied, using an approximation Rayleigh–Timoshenko equation. process assumed be hysteretic. behavior described terms modulus and loss factor, taking homogenized values. critical speeds obtained several analytical forms determine effects factors such as rotatory inertia, gyroscopic forces, transverse shear stiffness. Assuming hysteretic expressed equivalent viscous model, threshold speed form criterion. influence various involved quantified at first subcritical previously literature. coupling mechanisms unsymmetrical end fittings also finite element model. None these parameters were found decisive case. Those having greatest stacking sequence, length stiffness then investigated. particular, shafts consisting only ±45° or ±30° plies said generally regime due their very high factors.